MASTER: optical transients

ATel #7938; O. Gress, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), R. Rebolo, M. Serra-Ricart , N. Lodieu, G. Israelian (The Instituto de Astrofisica de Canarias), V. Kornilov, P. Balanutsa, N. Tiurina, A. Kuznetsov, V. Chazov, D. Vlasenko, I. Gorbunov, E. Popova (Lomonosov Moscow State University, Sternberg Astronomical Institute), D. Buckley, S. Potter, M. Kotze (South African Astronomical Observatory), O. Gress, N. M. Budnev, K. Ivanov (Applied Physics Institute, Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik, A. V. Parhomenko (Kislovodsk Solar Station of the Pulkovo Observatory), V. Krushinski, I. Zalozhnykh (Ural Federal University), Yu. Sergienko, A. Gabovich, V. Yurkov (Blagoveschensk Educational State University)
on 22 Aug 2015; 06:04 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J165538.99+601159.3 - flare(outburst) of optical transient

MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 16h 55m 38.99s +60d 11m 59.3s on 2015-08-20.026UT with unfiltered magnitude is 14.8m (the limit is 19.0m), and m_OT=15.2 on 2015-08-20.029.

There are 3 images with OT in active state.We observed it in MASTER-Tunka on 2015-08-21.727UT, m_OT=17.8 . We have reference images in MASTER-IAC database on 2015-07-22.97591 UT with unfiltered m_OT=17.8. There is no minor planet at this place.

Spectral observations are required.

The discovery and reference images are available at http://observ.pereplet.ru/images/MASTEROTJ165538.99+601159.3.jpg

MASTER OT J162323.48+782603.3 (ATEL #5643) outburst MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 16h 23m 23.48s +78d 26m 03.0s on 2015-08-19.69981 UT.The OT unfiltered magnitude is 14.2m (the limit is 18.3m).

The OT is seen in 20 images. There is no minor planet at this place.

We have reference image with OT on 2014-04-08.81803 UT with 19.5 unfiltered magnitude limit.

Spectral observations are required.

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